/* ------------------------------------------------------------------
   Sagnik Mukherjee — ink on paper.
   Flat white (or black), one vermilion, set in JetBrains Mono.
   The drawings live in art.js.
   ------------------------------------------------------------------ */

:root {
  --paper: #ffffff;
  --paper-deep: #f5f5f5;
  --ink: #000000;
  --ink-2: #262626;
  --ink-3: #6b7280;
  --red: #d63422;

  --display: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --line: rgba(0, 0, 0, 0.12);
  --code-bg: rgba(0, 0, 0, 0.05);
  --red-soft: rgba(214, 52, 34, 0.5);

  /* paper-coloured glow, so ink reads cleanly over leaves and fish */
  --halo: 0 0 2px var(--paper), 0 0 7px var(--paper), 0 0 16px rgba(255, 255, 255, 0.9);
  color-scheme: light;
}

/* night: wet ink for paper, paper for ink */
:root[data-theme="dark"] {
  --paper: #000000;
  --paper-deep: #111111;
  --ink: #ffffff;
  --ink-2: #e5e5e5;
  --ink-3: #8b8f97;
  --red: #ef5a42;
  --line: rgba(255, 255, 255, 0.14);
  --code-bg: rgba(255, 255, 255, 0.08);
  --red-soft: rgba(239, 90, 66, 0.55);
  --halo: 0 0 2px var(--paper), 0 0 8px var(--paper), 0 0 18px rgba(0, 0, 0, 0.92);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { min-height: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--text);
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: rgba(214, 52, 34, 0.24); color: var(--ink); }

/* ---------- scene ---------- */

#scene {
  position: fixed;
  inset: 0;
  overflow: hidden;
  z-index: 0;
  user-select: none;
  -webkit-user-select: none;
}
#scene canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}
#art { touch-action: pan-y; }   /* taps skip to the next figure; swipes still scroll */

/* ---------- content ---------- */

#app {
  position: relative;
  z-index: 10;
  min-height: 100svh;
  pointer-events: none;            /* empty space falls through to the water… */
}

.site {
  /* one gap everywhere, and the intro and photo share a row so their edges line up */
  display: grid;
  grid-template-columns: minmax(0, 52rem) 240px;
  gap: 18px;
  align-items: stretch;
  max-width: calc(52rem + 258px);
  padding: 48px 48px 64px;
  text-shadow: var(--halo);
}
.site h1, .site p, .site a, .site h3 { pointer-events: auto; }   /* …but not the text */

h1 {
  margin: 0 0 14px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
}

/* boxes: a hairline frame with a solid fill, so the map runs behind, not through */
.box {
  pointer-events: auto;
  background: var(--paper);
  border: 1px solid var(--ink);
  padding: 22px 26px 24px;
}
.site > .intro { grid-column: 1; grid-row: 1; display: flex; flex-direction: column; }
.site > .photo-col { grid-column: 2; grid-row: 1; align-self: start; }
/* papers run the full width, under both the intro and the photo */
.site > .news-box { grid-column: 1 / -1; grid-row: 2; }
.site > .papers { grid-column: 1 / -1; grid-row: 3; }
.site > .mentoring { grid-column: 1 / -1; grid-row: 4; }
.mentoring h3 { margin-top: 0; }
.mentoring p { font-size: 12.5px; line-height: 1.65; }
.mentoring-list { list-style: none; margin: 18px 0 0; padding: 0; }
.mentoring-list li { font-size: 12.5px; line-height: 1.65; }
.mentoring-list li + li { margin-top: 16px; }
.mentoring-affiliation { color: var(--ink-2); }
.mentoring-paper { display: block; margin-top: 3px; font-size: 11.5px; }

/* pin the links to the bottom edge, so the box ends on the same line as the photo */
.intro .social { margin-top: auto; }
.box :is(.list, .news, .mentoring) h3:first-child { margin-top: 0; }

/* the photo: whole, uncropped, framed like the boxes */
.portrait {
  pointer-events: auto;
  display: block;
  width: 100%;
  height: auto;
  box-sizing: border-box;
  padding: 8px;
  background: var(--paper);
  border: 1px solid var(--ink);
}

/* not enough width for a side column: the photo leads instead */
@media (max-width: 1180px) {
  .site { grid-template-columns: minmax(0, 52rem); }
  .site > .photo-col { grid-column: 1; grid-row: 1; width: 200px; }
  .site > .intro { grid-row: 2; }
  .site > .news-box { grid-row: 3; }
  .site > .papers { grid-row: 4; }
  .site > .mentoring { grid-row: 5; }
}

.title-row {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 0 0 16px;
}
.title-row h1 { margin: 0; }


.bio {
  margin: 0 0 14px;
  max-width: 46em;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-2);
}
.bio b {
  font-weight: 700;
  color: var(--ink);
  padding: 0 3px;
  /* a quick vermilion wash behind the words */
  background:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 24' preserveAspectRatio='none'%3E%3Cpath d='M2 14 C 24 10, 70 12, 110 10.5 S 178 9.5, 198 11.5 C 199 15.5, 172 18, 118 18.5 S 34 20.5, 3 18.5 Z' fill='%23d63422' fill-opacity='0.2'/%3E%3C/svg%3E")
    center 72% / 100% 70% no-repeat;
}
.bio a, .mentoring a {
  color: var(--ink);
  font-weight: 400;
  text-decoration: none;
  border-bottom: 1px solid var(--red-soft);
  transition: color 0.25s, border-color 0.25s;
}
.bio a:hover, .mentoring a:hover { color: var(--red); border-color: var(--red); }

.social {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 11px;
  margin: 0;
  font-family: var(--display);
  font-size: 12.5px;
}
.social a {
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.25s;
}
.social a:hover { color: var(--red); }
.theme-toggle {
  /* a small square in the corner, like a terminal button */
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 30;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  padding: 0;
  background: var(--paper);
  border: 1px solid var(--ink);
  color: var(--ink);
  cursor: pointer;
  transition: color 0.2s, border-color 0.2s;
}
.theme-toggle:hover { color: var(--red); border-color: var(--red); }
.theme-toggle:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
.theme-toggle svg { width: 17px; height: 17px; grid-area: 1 / 1; }
.theme-toggle .moon { fill: currentColor; }
.theme-toggle .sun { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; display: none; }
.theme-toggle .sun circle { fill: currentColor; stroke: none; }
:root[data-theme="dark"] .theme-toggle .moon { display: none; }
:root[data-theme="dark"] .theme-toggle .sun { display: block; }

.social a { display: inline-flex; line-height: 0; }
.social svg { width: 18px; height: 18px; fill: currentColor; display: block; }
.social { gap: 18px; }

.social .dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--ink-3);
  opacity: 0.7;
}

/* ---------- the lists ---------- */

.list { display: grid; gap: 2px; }

:is(.list, .news, .mentoring) h3 {
  position: relative;
  margin: 28px 0 6px;
  padding-bottom: 7px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}
:is(.list, .news, .mentoring) h3:first-child { margin-top: 0; }
:is(.list, .news, .mentoring) h3::after {
  /* a dry brush stroke under each heading */
  content: "";
  position: absolute;
  left: -3px;
  bottom: 0;
  width: 120px;
  height: 5px;
  opacity: 0.55;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 14' preserveAspectRatio='none'%3E%3Cpath d='M3 7.5 C 46 4.5, 118 5.5, 176 6 S 262 5.5, 297 3.8 C 291 8.5, 248 10, 176 10.4 S 58 11.8, 5 10.6 Z' fill='%23000000' fill-opacity='0.72'/%3E%3Cpath d='M24 8.6 C 86 7.2, 158 7.8, 236 6.8' stroke='%23ffffff' stroke-width='0.8' fill='none' stroke-opacity='0.8'/%3E%3Cpath d='M70 6.6 C 128 6.1, 196 6.4, 268 5.6' stroke='%23ffffff' stroke-width='0.55' fill='none' stroke-opacity='0.7'/%3E%3C/svg%3E") left center / 100% 100% no-repeat;
}

:root[data-theme="dark"] :is(.list, .news, .mentoring) h3::after {
  opacity: 0.5;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 14' preserveAspectRatio='none'%3E%3Cpath d='M3 7.5 C 46 4.5, 118 5.5, 176 6 S 262 5.5, 297 3.8 C 291 8.5, 248 10, 176 10.4 S 58 11.8, 5 10.6 Z' fill='%23ffffff' fill-opacity='0.72'/%3E%3Cpath d='M24 8.6 C 86 7.2, 158 7.8, 236 6.8' stroke='%23000000' stroke-width='0.8' fill='none' stroke-opacity='0.8'/%3E%3Cpath d='M70 6.6 C 128 6.1, 196 6.4, 268 5.6' stroke='%23000000' stroke-width='0.55' fill='none' stroke-opacity='0.7'/%3E%3C/svg%3E");
}
:root[data-theme="dark"] .bio b {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 24' preserveAspectRatio='none'%3E%3Cpath d='M2 14 C 24 10, 70 12, 110 10.5 S 178 9.5, 198 11.5 C 199 15.5, 172 18, 118 18.5 S 34 20.5, 3 18.5 Z' fill='%23ef5a42' fill-opacity='0.3'/%3E%3C/svg%3E");
}

.list { counter-reset: paper; }

.list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 3.5px 0;
  font-size: 12.5px;
  line-height: 1.45;
  color: var(--ink);
  text-decoration: none;
  counter-increment: paper;
}
.list a::before {
  /* [1], [2], … like a reference list; turns red on hover */
  content: "[" counter(paper) "]";
  flex: none;
  width: 2.4em;
  font-size: 11.5px;
  color: var(--ink-3);
  font-variant-numeric: tabular-nums;
  transition: color 0.25s;
}
.list a:hover::before { color: var(--red); }

.lc {
  position: relative;
  flex: 1;
  transition: transform 0.35s cubic-bezier(.2, .7, .2, 1);
}
.list a:hover .lc { transform: translateX(3px); }
.lc::after {
  /* a vermilion brush line that sweeps in under the title */
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 6px;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 300 12' preserveAspectRatio='none'%3E%3Cpath d='M2 6.6 C 54 4.2, 128 5.2, 198 5.4 S 278 4.8, 298 3.2 C 296 7.2, 258 8.6, 190 8.8 S 54 10.2, 3 9.6 Z' fill='%23d63422' fill-opacity='0.55'/%3E%3C/svg%3E") left center / 100% 100% no-repeat;
  clip-path: inset(0 100% 0 0);
  transition: clip-path 0.55s cubic-bezier(.65, 0, .25, 1);
}
.list a:hover .lc::after { clip-path: inset(0 0 0 0); }

/* news scrolls inside its box; the heading stays put */
.news-scroll {
  max-height: 128px;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--ink-3) transparent;
}
.news-scroll:focus-visible { outline: 1px dashed var(--ink-3); outline-offset: 4px; }
.news-scroll::-webkit-scrollbar { width: 4px; }
.news-scroll::-webkit-scrollbar-thumb { background: var(--ink-3); }
.news-scroll::-webkit-scrollbar-track { background: transparent; }

/* news: date column, then the line */
.news-item {
  display: grid;
  grid-template-columns: 7.2rem 1fr;
  column-gap: 12px;
  align-items: baseline;
  padding: 3.5px 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--ink-2);
}
.news-item .date { white-space: nowrap; }
.news-item b { color: var(--ink); font-weight: 700; }
.news-item a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--red-soft);
  transition: color 0.25s, border-color 0.25s;
}
.news-item a:hover { color: var(--red); border-color: var(--red); }

/* venue badges sit in their own column so they line up down the list */
.lc {
  display: grid;
  grid-template-columns: 8.4rem 1fr;
  column-gap: 12px;
  align-items: baseline;
}

.tag {
  justify-self: start;
  font-family: var(--display);
  font-size: 10.5px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--red);
  border: 1px solid var(--red);
  padding: 0 6px;
  text-shadow: none;
}
.tag.preprint { color: var(--ink-3); border-color: var(--line); }
.tag u { text-decoration-thickness: 1.5px; text-underline-offset: 2px; }

.date {
  flex: none;
  font-size: 11px;
  color: var(--ink-3);
  white-space: nowrap;
}


/* ---------- a post ---------- */

.post-page #app { pointer-events: auto; }

.post { max-width: 42rem; }

.post-top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 0 0 28px;
  font-family: var(--display);
  font-size: 12.5px;
}

.back {
  display: inline-block;
  font-family: var(--display);
  font-size: 12.5px;
  color: var(--ink-2);
  text-decoration: none;
  transition: color 0.25s;
}
.back:hover { color: var(--red); }

.post h1 { font-size: 22px; line-height: 1.25; margin-bottom: 8px; }

.post-meta {
  margin: 0 0 28px;
  font-size: 11px;
  color: var(--ink-3);
}

.post-body { font-size: 13.5px; line-height: 1.75; color: var(--ink-2); }
.post-body h2 {
  font-family: var(--display);
  font-weight: 700;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  margin: 2.2rem 0 0.6rem;
}
.post-body h3 { font-size: 13.5px; font-weight: 700; color: var(--ink); margin: 1.8rem 0 0.4rem; }
.post-body p { margin: 0 0 1.05rem; }
.post-body ul, .post-body ol { margin: 0 0 1.05rem; padding-left: 1.3rem; }
.post-body li { margin-bottom: 0.3rem; }
.post-body a { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--red-soft); }
.post-body a:hover { color: var(--red); border-color: var(--red); }
.post-body img { max-width: 100%; height: auto; display: block; margin: 1.6rem 0; }
.post-body blockquote {
  margin: 1.4rem 0;
  padding-left: 1rem;
  border-left: 2px solid var(--red-soft);
}
.post-body hr { border: none; border-top: 1px solid var(--line); margin: 2.2rem 0; }
.post-body table { width: 100%; border-collapse: collapse; margin: 1.4rem 0; font-size: 12.5px; }
.post-body th, .post-body td { text-align: left; padding: 0.4rem 0.6rem; border-bottom: 1px solid var(--line); }
.table-scroll { overflow-x: auto; }
.footnote { font-size: 12px; }

code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 0.1em 0.3em;
  border-radius: 3px;
  text-shadow: none;
}
pre {
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  margin: 1.4rem 0;
  font-size: 12px;
  line-height: 1.6;
  text-shadow: none;
}
pre code { background: none; padding: 0; font-size: inherit; }

.hljs-comment, .hljs-quote { color: #6b7280; font-style: italic; }
.hljs-keyword, .hljs-selector-tag, .hljs-literal, .hljs-built_in { color: #d63422; }
.hljs-string, .hljs-regexp { color: #5b6e44; }
.hljs-number, .hljs-meta { color: #9a6324; }
.hljs-title, .hljs-section, .hljs-name { color: #000000; font-weight: 700; }
.hljs-attr, .hljs-variable, .hljs-params, .hljs-type { color: #6b5a3e; }

:root[data-theme="dark"] .hljs-comment, :root[data-theme="dark"] .hljs-quote { color: #8b8f97; }
:root[data-theme="dark"] .hljs-keyword, :root[data-theme="dark"] .hljs-selector-tag,
:root[data-theme="dark"] .hljs-literal, :root[data-theme="dark"] .hljs-built_in { color: #ef5a42; }
:root[data-theme="dark"] .hljs-string, :root[data-theme="dark"] .hljs-regexp { color: #a9c08a; }
:root[data-theme="dark"] .hljs-number, :root[data-theme="dark"] .hljs-meta { color: #d9a25c; }
:root[data-theme="dark"] .hljs-title, :root[data-theme="dark"] .hljs-section,
:root[data-theme="dark"] .hljs-name { color: #ffffff; }
:root[data-theme="dark"] .hljs-attr, :root[data-theme="dark"] .hljs-variable,
:root[data-theme="dark"] .hljs-params, :root[data-theme="dark"] .hljs-type { color: #c9b58e; }

/* ---------- entrance: ink settling onto paper ---------- */

.js .reveal {
  opacity: 0;
  filter: blur(4px);
  transform: translateY(5px);
}
.js.ready .reveal {
  animation: settle 1.05s cubic-bezier(.2, .6, .2, 1) forwards;
  animation-delay: calc(var(--i, 0) * 40ms + 140ms);
}
@keyframes settle { to { opacity: 1; filter: none; transform: none; } }

/* the name is written left to right, like a brush */
.js h1.reveal { opacity: 1; filter: none; transform: none; clip-path: inset(-15% 100% -25% 0); }
.js.ready h1.reveal { animation: write 1.4s cubic-bezier(.5, .1, .3, 1) 0.1s forwards; }
@keyframes write {
  0%   { clip-path: inset(-15% 100% -25% 0); filter: blur(2.5px); }
  70%  { filter: blur(0.4px); }
  100% { clip-path: inset(-15% -5% -25% 0); filter: none; }
}

/* ---------- small screens ---------- */

@media (max-width: 680px) {
  body { font-size: 13px; }
  .site { padding: 56px 12px 40px; }
  h1 { font-size: 24px; }
  .theme-toggle { top: 12px; right: 12px; width: 32px; height: 32px; }
  .box { padding: 16px 15px 18px; }
  .site > .photo-col { width: 150px; }
  .site { gap: 14px; }
  .post h1 { font-size: 19px; }
  .bio { font-size: 13px; }
  .social { font-size: 12px; gap: 9px; }
  .list a { gap: 10px; font-size: 12px; }
  .news-item { grid-template-columns: 1fr; row-gap: 2px; font-size: 12px; }
  .news-scroll { max-height: 190px; }
  /* no room for a column on a phone: the badge sits above the title */
  .lc { grid-template-columns: 1fr; row-gap: 3px; }
  .tag { font-size: 9.5px; }
  .date { font-size: 10.5px; }
  :is(.list, .news, .mentoring) h3 { font-size: 11.5px; }
  .post-body { font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .js .reveal, .js.ready .reveal, .js h1.reveal, .js.ready h1.reveal {
    animation: none !important;
    opacity: 1;
    filter: none;
    transform: none;
    clip-path: none;
  }
}